Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C39/00—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring
  • C07C39/23—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring polycyclic, containing six-membered aromatic rings and other rings, with unsaturation outside the aromatic rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
  • C07C37/11—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by reactions increasing the number of carbon atoms
  • C07C37/14—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by reactions increasing the number of carbon atoms by addition reactions, i.e. reactions involving at least one carbon-to-carbon unsaturated bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
  • C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
  • C07D311/78—Ring systems having three or more relevant rings
  • C07D311/80—Dibenzopyrans; Hydrogenated dibenzopyrans
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
  • C07C2601/16—Systems containing only non-condensed rings with a six-membered ring the ring being unsaturated

Definitions

• Cannabinoid compounds are components which can be isolated from Cannabis spp. Due to its physiological activity trans-delta-9-tetrahydrocannabinol ( ⁇ 9 -THC) is of substantial significance. This compound is also referred to as 6a,7,8,10a-tetradydro-6,6,9-trimethyl-3-pentyl-6H-dibenzo[b,d]pyran-1-ol.
• the psychotropic but non-habit forming effects mean that this compound is of interest as pharmaceutical component.
• One object of the present invention is therefore to provide a method for the production of trans-delta-9-tetrahydrocannabinol both with a sufficient purity and also on an industrial scale.
• trans-delta-9-tetrahydrocannabinol is produced as an intermediate, which may be readily purified by crystallization. This intermediate is then converted by ring condensation to the desired delta-9-THC.
• the first step is to produce the intermediate 6,12-dihydro-6-hydroxy-cannabidiol which may also be termed
• the starting materials are the readily available olivetol (formula II) and cis-p-menth-2-ene-1,8-diol (formula III).
• the reaction is performed in a suitable solvent, aromatic hydrocarbons such as benzene and toluene, halogenated hydrocarbons such as methylene chloride, chloroform, dichloroethane and trichloroethane, ethers such as diethylether, diisopropylether and tetrahydrofuran having proved to be suitable.
• aromatic hydrocarbons such as benzene and toluene
• halogenated hydrocarbons such as methylene chloride, chloroform, dichloroethane and trichloroethane
• ethers such as diethylether, diisopropylether and tetrahydrofuran having proved to be suitable.
• mixtures of the said solvents are possible to use mixtures of the said solvents.
• Toluene, benzene, methylene chloride and chloroform are the preferred solvents for use in the method of the invention.
• the reaction in accordance with the invention is performed in the presence of a suitable catalyst, proton acids such as for instance haloid acids, sulfuric acid, phosphoric acid, perchloric acid, organic sulfonic acids, such as for instance methanesulfonic acid and p-toluenesulfonic acid, carboxylic acids, such as for instance oxalic acid, trifluoroacetic acid and other Lewis acids, such for instance boron trifluoride, ferric chloride, zinc chloride, zinc bromide, stannic chloride, titanium chloride or iodine having proved to be suitable.
• a suitable catalyst proton acids such as for instance haloid acids, sulfuric acid, phosphoric acid, perchloric acid, organic sulfonic acids, such as for instance methanesulfonic acid and p-toluenesulfonic acid, carboxylic acids, such as for instance oxalic acid, trifluoroacetic acid and other Lewis acids, such for instance boro
• hydrochloric acid and p-toluenesulfonic acid are used in accordance with the invention.
• the method may be performed at temperatures between approximately -30° C. and +50° C., temperatures between 0° C. and 20° C. being preferred.
• reaction times are dependent on the solvent, the catalyst used and the reaction temperature. In fact it is possible to use reaction times between a few minutes and several hours.
• the intermediate product produced may then be readily further purified by recrystallization.
• the use of petroleum ether has turned out to be suitable for the recrystallization.
• Ring condensation may be used to produce the trans-delta-9-tetrahydrocannabinol ( ⁇ 9 -THC) from 6,12-dihydro-6-hydroxy-cannabidol.
• This reaction is performed in a suitable solvent with the use of suitable catalysts and water binding substances.
• the solvent is in the form of a hydrocarbon, as for instance hexane, heptane, cyclohexane, petroleum ether, aromatic hydrocarbons, such as for instance benzene, toluene, chorinated hydrocarbons, such as for instance methylene chloride, chloroform and dichloroethane.
• methylene chloride and chloroform are used.
• mixtures of the solvents may be used.
• Lewis acids such as for instance zinc chloride, zinc bromide, boron trifluoride, ferric chloride, stannic chloride, titanium chloride or iodine are used, zinc chloride and zinc bromide having proved to be more particularly suitable.
• Water binding substances such as neutral substances as for instance magnesium sulfate, sodium sulfate, calcium sulfate or molecular sieves may be used, the last-named having proved more particularly suitable.
• the reaction is performed at a temperature between approximately -20° C. and the boiling point of the corresponding solvent.
• reaction times are dependent on the catalyst, the solvent, the water binding substance and the reaction temperature. Dependent on the selected conditions times from a few minutes to several days are required.
• the petroleum ether phase was then run into a silica gel column (approximately 500 g of silica gel) and eluted with a mixture of petroleum ether (50/70) and diisopropylether (2:1). The eluate was reduced in volume under vacuum and the residue (approximately 102 g) was recrystallized from 600 ml of petroleum ether (50/70). 77 g of the desired product were obtained.
• the characteristic data of the 6,12-dihydro-6-hydroxy-cannabidiol were as follows:
• UV spectrum (UV) ⁇ max (ethanol 95%) 275 nm ( ⁇ 1024) ⁇ max (ethanol 95%) 281 nm ( ⁇ 987)
• Infrared spectrum (IR, KBr pellet) [cm] -1 3392, 2956, 2930, 2859, 1630, 1582, 1446, 1379, 1369, 1335, 1308, 1231, 1202, 1186, 1158, 1076, 1046, 1028.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Pyrane Compounds (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

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• 1991
  • 1991-01-09 DE DE4100441A patent/DE4100441A1/de not_active Withdrawn
• 1992
  • 1992-01-08 US US07/818,040 patent/US5227537A/en not_active Expired - Fee Related
  • 1992-01-09 ES ES92100258T patent/ES2071351T3/es not_active Expired - Lifetime
  • 1992-01-09 AT AT92100258T patent/ATE121066T1/de not_active IP Right Cessation
  • 1992-01-09 EP EP92100258A patent/EP0494665B1/de not_active Expired - Lifetime
  • 1992-01-09 JP JP4002315A patent/JP2637659B2/ja not_active Expired - Fee Related
  • 1992-01-09 DK DK92100258.0T patent/DK0494665T3/da active
  • 1992-01-09 DE DE69201959T patent/DE69201959T2/de not_active Expired - Fee Related

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Non-Patent Citations (4)

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